Malicious PDF — malware analysis report

Static analysis result for SHA-256 403ddb97ccc0d3fe…

MALICIOUS

PDF

85.4 KB Created: 2020-11-24 08:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37c5b009666c2b8e6d73c0cf6d115277 SHA-1: 1ea71fa73a6fc3db7f7599af9d10715b1459f873 SHA-256: 403ddb97ccc0d3fea57f32577f9c5cbfaf93fb78f6a1d4a0bb2202f8f7675580
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, including a link farm heuristic firing, suggesting an attempt to direct users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffset.ru/aws?utm_term=alif+allah+aur+insaan+episode+37
    • https://cdn-cms.f-static.net/uploads/4375890/normal_5f8abfdfc4ca0.pdf
    • https://cdn-cms.f-static.net/uploads/4417403/normal_5fb8de6954f46.pdf
    • https://vezorobabuwej.weebly.com/uploads/1/3/0/9/130969079/1ee5bae.pdf
    • https://cdn-cms.f-static.net/uploads/4387562/normal_5fb024d843126.pdf
    • https://cdn-cms.f-static.net/uploads/4367308/normal_5faaecc755f24.pdf
    • https://cdn-cms.f-static.net/uploads/4370299/normal_5f88ffd1933bd.pdf
    • https://cdn-cms.f-static.net/uploads/4391621/normal_5f98492bd71a9.pdf
    • https://cdn-cms.f-static.net/uploads/4387939/normal_5f8fb5f49602c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rirusozo/wikeludapuwinabeda.pdf
    • https://s3.amazonaws.com/zazelujeju/93390110978.pdf
    • https://s3.amazonaws.com/wegugus/jumeloloje.pdf
    • https://s3.amazonaws.com/takurugilij/daduwetunerib.pdf
    • https://s3.amazonaws.com/vikukinumet/tenancy_at_will_california_law.pdf
    • https://s3.amazonaws.com/vedexajawo/chris_tucker_live.pdf
    • https://s3.amazonaws.com/geraromu/boney_m_songs_video_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8f4.bin
5d578e2b13ed52613cc16dea90eb02124b8174956e1db9a0e367f3cf83c4c87e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 5364 bytes
font_01_sfnt_off00010b39.bin
0145d5764e0dfef1a20381fc8e66c76092461df4606515c381db4f079849fc68
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B39 10804 bytes
font_02_sfnt_off00013032.bin
64729a0bb6bbd648027455d283cdf3b2a6cd847fd66c53ed322e2feae1afec97
pdf-font-stream PDF embedded font (sfnt) at offset 0x13032 16500 bytes